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you will get a fraction of an R-value because of the air gap that it creates, but mostly you will reflect all of your infrared heat back into the room instead of letting it soak in to the structure of the house, I am pretty sure that white zinc oxide paint will do more or less the same thing without being silver and zinc oxide paint might even do a better job because from what I remember reading about it, it radiates infrared and reflect it.
I have yet to find it for sale, but I've read about what is most often sold as ceiling paint, an insulated, reflective paint that they claimed you could paint over and it would still hold most of it's properties, but as I said, I've never found it for sale.
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